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A decent quality electrician’s screwdriver will have its insulation voltage rating stamped on its handle, though the absence of a rating is not necessarily a reason not to use it. A lot of screwdrivers have first-rate insulated handles, but without a voltage rating because they are sold for general-purpose use rather than specifically electronic. When you choose a screwdriver or other tool, consider the amount of plastic it puts between you and the metal, and pick accordingly. Wooden handles may not provide adequate protection, and metal handles should be avoided at all costs.

High-end professional SLRs drop the mirror between exposures, providing a direct (however brief) view of the subject between shots. In contrast, in their highest-speed capture modes, the Sony A33 and A55 display a static image of the shot they’ve just captured. Rather than seeing interrupted glimpses of your subject in motion, the A55 displays a procession of still images, each lagging the subject motion.

On the Sony A33 and A55, the EVF can serve as both shooting and playback display. As mentioned earlier, the ability to check your shots and make camera settings without taking your eye from the eyepiece leads to a slightly different and more efficient shooting style; one that encourages you to learn the camera by feel and memory, rather than looking at the controls as you press them. I’ve only had a few days with the camera as of this writing, but can see that greater familiarity will produce a very efficient shooting style.

Before the code prohibited it, it was common practice to share neutrals between circuits. It was customary to pull three hot conductors – fed from three different phases on a three-phase system – a neutral and a ground into a single conduit in commercial facilities. The assumption was that the neutral carried only the unbalance between the three phases, and that would never exceed the highest current in a phase conductor. Now, you can’t do that anymore, unless you use a three-pole circuit breaker, handle ties, or a three pole disconnect switch.

It’s probably worth at this point explaining for a minute how earthing works with respect to mains power. You will have a local earth connection at your house, and your utility company will connect the neutral line to an earth at the substation to ensure that line voltages are not induced at a higher voltage with respect to their surroundings than the voltage they are supposed to carry. There may be 110V or 230V between the live and the neutral depending where you live, but without that earth connection both of those conductors could end up at thousands of volts higher than their surroundings, for example in a thunderstorm. The earth connection provides a fixed relationship between line voltage and the surroundings, such as the utility poles, trees, your house, and you.

So far we have discussed your bench and associated equipment. We are not however quite done though, because there is one final component in keeping your bench safe: you. If you have a piece of equipment in front of you and you are about to open it up, the most significant part of your safety routine doesn’t lie with your equipment, but in how you approach it.

I like these more and more. Good size for my needs, and handsome styling. Standard hybrid probably makes more sense for me, but I’d have to give it a look.

From the Auris to this, haven’t Toyota learnt anything. It’s just a slightly bigger and slightlly less DULL than the car it replaces.

Also I have seen opto-couples where the pins have been spayed out to gain an extra 0.1″ between the rows of pins.

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There are numerous safe ways to do this, without reinventing the wheel. Like so: http://www.omega.com/pptst/HCS_HEATER.html (Need 240 mains? Hook two in series.) Precision control circuit can be found in the Data sheet for LM34 temp sensor. Uses an LM10 combo op-amp/ref to switch a solid state relay. Doc

The likely hazards identified, what are you about to do with it? Are you just opening it for curiosity’s sake, are you going to work on the high voltage circuit to fix it, or is it surplus that you’re scavenging for parts? If you’re just curious or simply scavenging parts, you may not have to increase the risk by applying power in the first place, so what other risks might remain?